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(No Model.) '4 Sheets-Sheet 1.

'A,GUTMANN. SAND BLAST AND APPARATUS EMPLOYED IN OPERATING BY.

SAND BLASTS.

' No 573,180.' Patented.Dec.15,18Q6.

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III IZI Whaf 66 1+ woman. 4 SheePs-Sheet 2. A. GUTMANN.

SAND BLAST AND APPARATUS EMPLOYED IN OPERATING BY SAND BLASTS.

No. 573,180. yamme Dec. 15, 1896.

(No Modl A 4 Sheets'-Sheet 4 A.GUTMANN. SAND BLAST AND APPARATUS EMPLOYED IN OPBRATING BY SAND BLASTS.

No. 573.180. rammed Dec. 15, 1896.

i v Q i: r z tlfjzz Q UNITED STATES PATENT Orrrcn.

ALFRED GUTMANN,.QF OTTENVSEN, GERMANY.

SAND-BLAST AND APPARATUSEMPLOYED IN OPERATING. BY-SAND-BL'ASTS.

SPECIFICATION forming part of Letters Patent No. 573,180, dated December 15, 1896;

Application filed November 3, 189% Serial No; 527,836. (No model.) Patented in England March 21, 1887, No. 4,217; in Belgium March 31, 1,387,170. 76,784, and in Austria-Hungary August 24, 1887, lie-11,762 and-No, 36,786.

To all whom it may concern.-

Be it known that I, ALFRED GUTMANN, of

Otteusen, in the German Empire, haveinvented a new. and useful Improvement in Sand-Blast Apparatus, of whichthe following is a s pecification, and which has been patented in Great Britain by Patent N 0. 4,217, dated March 21, 1887; in Belgium, by brevet, No. "76,784, dated MarchBl, 1887, and in Austria- Ilungary, by privilegium, No. 11,7 62 and No.

36,786, dated August 24, 1887;

To enable others skilled in the art to make and use my invention, I will now describe it with reference to the annexed drawings, in

Figure 1 is a sectional side elevation of a sand-blast apparatus embodying my inven.-. tion, showing-the arrangement of the sandudzzle and or the continuously or intermittently rotating table; Fig. 2, a front elevation of such apparatus; Fig. 3, a plan and Fig. 4 atranst'erse section in the line a b c d 0fFig.1. f

A is a covered casing within which is the lower sand-receiver, consisting of a'vessel or shell, one wall, A, of which is cylindrically shaped, Whereas the opposite wall, A is formed byan inclined plate meeting the inner side of the wall A in a curve, as clearly shown in Figs. 2 and 4. B is a second sandreceiver of rectangular form placed above the oasing A, which contains the sand-receiver A A The sand falling from the upper receiver B in the manner hereinafterdescribed into the lower receiver A A thereby doing work on the objects to be treated, is continuously elevated back to the receiver B by an elevator 0, formed of an endless chain or strip provided with small buckets. Such elevatoris inclosed within a easin g placed at the outside of the sand-receivers A, A and B. The sand transported falls into a funnel 0*, provided with a tube extending to the interior, of. the receiver B.

Rotary'motion is'comm'unicated to the upper disk D, carrying the elevator'chain or strip, by a fast and loose pulleyE on the upper shaft for the disk D. The lower e1evat0rdisk. D is keyed to a second shaftpassing through a covered opening A in the bottom of the casing'.A. This lower sand-receiver A A is separated from the upper sand-re ceiver B by a funnel-shaped bottom F, as clearly shown by Fig. 4c, the horizontal part of such bottom' being provided with two parallel slots-F F2, whichform. the nozzles for the sand passing from the upper receiver B to the lower one vA A Above and between such longitudinal slots foriningsand-nozzles the blast-air pipe G is arranged, such blastpipe being provided with an air-nozzle G, vplaced between the sand-nozzles F F. By these no'zzles,which may be closed temporarily or regulated by shutters ff fromoutside, the sand within thefunnel-shaped hottom is blown in in a downward direction. 7

Both theair-noz zle and the sand-nozzles ex tendwhollvor. nearly so mate entire width of the uppersand-receiver B,so that a broad current ofisand is ejected down to the objects to be sanded. "These-objects are placed on a continuously or intermittently rotating circular table H, arranged between the combined nozzles and the lower sand-receiver A A This table H may be fixed or loosely-placed on a vertical shaft H, the lower end of which bears Within a step H whereas the upper end of said shaft works in a bearing within a flanged table or disk H carried by the arms ,9. carried or fed underneath the combined air and sand nozzles F F G, which powerfully eject the air-current with the sand against the surfaces of the objects to be treated. It will be preferable to perforate the rotating table H in the manner shown at h h in Figs.

1 and 4. The form of such perforations is clearly shown in Fig. 3. 9011 perforations allow the sand, afterhatifig acted upon thesurfaces of the objects under treatment, to

fall through into the sand-receiver A A from which it is. eleyated again to the upper O exit from the casing. The rotary movement of the rotary table H shown in Fig. 3.

ings which are to be cleaned in a continuous manner by the action of the sand-blast.

If necessary, fresh sand may be supplied to the'interior of the elevator-casing by a hopper I, covered by a lid and arranged near the lower disk D of the elevator. J for the same purpose may be arranged at the top of the upper-Sand receiver B, as clearly For closing the casing A between the nozzles F F G and the rotating table H, whileat the same time allowing the objects under treatment to enter and exit from such casing, doors or. flaps K may be armnged, such doors or flaps hangingloosely at the frontedge of the casing, as shown in Figs. 1, 2, and 3, so that they may swing automatically when the objects placed on the rotating table enter or is derived from the step-pulley E through an endless belt placed on one of the step pn'lleys L. The shaft L, carrying the latter pulleys, has its bearings at the side of, he casing A, which includes the lower sand-receiver A A and the greater part of the rotating table H.

On the other end of this shaft carrying, the step-pulleys a bevel-wheel M is keyed, engaging another bevel-wheel, M, on a second shaft M 011 the other end of such second shaft another bevel-wheel, M is keyed, engaging a bevel-wheel H* at the under side, of the rotating table II, which is rotated when the drivrug-shaft at the top of the upper receiver B'is rotated.

A second lid superfluous air in the casing A of the sandblast apparatus is carried away in an upward direction by the conduits or tubes N N, placed on the covering-plate of the said casing above the rotating table H.

The operation of the apparatus is as follows 2 hen one-half of the rotating table II is filled with the objects to be treated, the apparatus 5 5 is set in motion and the blast-air pipe G over the combined nozzles F F- G is opened. Thus the blast-air projects the sand from above on the objects under treatment, while the objects pass underneath the combined nozzles. The sand having passed the perforations within the rotating table accumulates at the bottom of the lower sand-receiverA' A and'is raised by the elevator G, which delivers the sand to the upper sand-receiver B, whereupon the cycle of process is repeated. By the continuous rotation of the table H the finished objects will appear at the other side of the center of such table and are taken V away for replacing them without interruption 7o to the operation of the machine by other objects undergoing the same sand-blast action.

What I claim as my invention is 1. In a sand-blast apparatus, the combina tion with a rotating table II, of sand-blast nozzles F F G of a width corresponding approximately With the length of the radiusof the table, -substantially as herein described.

2. In a sand-blast apparatus, the combination with a rotating 'tableI-I and sand-blast 8o nozzles F F G, of an upper sand-receiver I3 above said table and alower sand-receiver A A below said table and an elevator C for retransporting the sand from the lower to the I upper receiver; substantially as herein described.

Intestimony that I claim the foregoing as my invention I have signed my name in pres ence of two subscribing witnesses.

ALFRED GUTMANX. Witnesses: I

E. W. MUMMENHOFF, CHAS. H. BURKE. 

